/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "mapinc.h"

#define MMC4reg mapbyte1
#define latcha1 mapbyte2[0]
#define latcha2 mapbyte2[1]


static void FP_FASTAPASS(1) latchcheck(uint32 VAddr) {
	uint8 l, h;

	h = VAddr >> 8;

	if (h >= 0x20 || ((h & 0xF) != 0xF))
		return;

	l = VAddr & 0xF0;

	if (h < 0x10) {
		if (l == 0xD0) {
			VROM_BANK4(0x0000, MMC4reg[0]);
			latcha1 = 0xFD;
		}else if (l == 0xE0) {
			VROM_BANK4(0x0000, MMC4reg[1]);
			latcha1 = 0xFE;
		}
	}else {
		if (l == 0xD0) {
			VROM_BANK4(0x1000, MMC4reg[2]);
			latcha2 = 0xFD;
		}else if (l == 0xE0) {
			VROM_BANK4(0x1000, MMC4reg[3]);
			latcha2 = 0xFE;
		}
	}
}

DECLFW(Mapper9_write) {       // $Axxx
	ROM_BANK8(0x8000, V);
}

DECLFW(Mapper10_write) {
	ROM_BANK16(0x8000, V);
}

DECLFW(Mapper9and10_write) {
	switch (A & 0xF000) {
	case 0xB000:
		if (latcha1 == 0xFD) {
			VROM_BANK4(0x0000, V);
		}
		MMC4reg[0] = V;
		break;
	case 0xC000:
		if (latcha1 == 0xFE) {
			VROM_BANK4(0x0000, V);
		}
		MMC4reg[1] = V;
		break;
	case 0xD000:
		if (latcha2 == 0xFD) {
			VROM_BANK4(0x1000, V);
		}
		MMC4reg[2] = V;
		break;
	case 0xE000:
		if (latcha2 == 0xFE) {
			VROM_BANK4(0x1000, V);
		}
		MMC4reg[3] = V;
		break;
	case 0xF000:
		MIRROR_SET(V & 1);
		break;
	}
}

void Mapper9_init(void) {
	latcha1 = 0xFE;
	latcha2 = 0xFE;
	ROM_BANK8(0xA000, ~2);
	ROM_BANK8(0x8000, 0);
	SetWriteHandler(0xA000, 0xAFFF, Mapper9_write);
	SetWriteHandler(0xB000, 0xFFFF, Mapper9and10_write);
	PPU_hook = latchcheck;
}

void Mapper10_init(void) {
	latcha1 = latcha2 = 0xFE;
	SetWriteHandler(0xA000, 0xAFFF, Mapper10_write);
	SetWriteHandler(0xB000, 0xFFFF, Mapper9and10_write);
	PPU_hook = latchcheck;
}

